Database connection C# WPF

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WPF

entity-framework

C#6.0

I am getting Nulls in my DbContext tables and would be grateful for a little help.

Model:

[Table("tblCustomer")]
    public class Customer
    {
        [Key]
        public int CustomerID { get; set; }
        public virtual ICollection<bike> Bikes { get; set; }
        [Display(Name = "Customer")]
        public string CustomerFirstName { get; set; }
        [Display(Name = "Surname")]
        public string CustomerSurName { get; set; }
    }

DbContext:

public class BikesDbContext
    {
        public DbSet<Customer> Customers { get; set; }
    }

ConnectionString in App.Config:

<entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
</entityFramework>
<connectionstrings>
    <add name="BikesDbContext" connectionString="server =(local)\SQLExpress;  AttachDbFilename=F:\Database\Bikes.mdf; database= db_Bikes; 
integrated security = SSPI" providerName="System.Data.SqlClient" />
</connectionStrings>

Call in code:

BikesDbContext db = new BikesDbContext();

      var Dataset = db.Customers.Where
                     (x => x.CustomerSurName.StartsWith("S"));

I am not seeing anything in the debug in db.Customers when I set a breakpoint at the var Dataset line and would be grateful for any help that anyone can give. The Database can be seen in the Server explorer and has entries in the table that begin with "S" in the Surname. It does appear to me that the DbContext is not really connected to the database.

Thanks

What I have tried:

I have tried all the above and am still getting Nulls in the Table from DbContext